static void uart_stm32_poll_out(struct device *dev,
unsigned char c)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
/* Wait for TXE flag to be raised */
while (!LL_USART_IsActiveFlag_TXE(UartInstance))
;
LL_USART_ClearFlag_TC(UartInstance);
LL_USART_TransmitData8(UartInstance, (u8_t)c);
}
int _write (int fd, const void *buf, size_t count) {
if ((fd != STDOUT_FILENO) && (fd != STDERR_FILENO)) {
errno = EBADF;
return -1;
}
// size_t i;
uint8_t* ch = ((uint8_t*)buf);
for(size_t i = 0; i < count; i++){
// while(!LL_USART_IsActiveFlag_TXE(USART6));
LL_USART_TransmitData8(USART6, *ch++);
while(!LL_USART_IsActiveFlag_TXE(USART6));
}
return count;
}
static int uart_stm32_fifo_fill(struct device *dev, const u8_t *tx_data,
int size)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
u8_t num_tx = 0U;
while ((size - num_tx > 0) &&
LL_USART_IsActiveFlag_TXE(UartInstance)) {
/* TXE flag will be cleared with byte write to DR|RDR register */
/* Send a character (8bit , parity none) */
LL_USART_TransmitData8(UartInstance, tx_data[num_tx++]);
}
return num_tx;
}
static int uart_stm32_irq_tx_complete(struct device *dev)
{
USART_TypeDef *UartInstance = UART_STRUCT(dev);
return LL_USART_IsActiveFlag_TXE(UartInstance);
}